THE TEETH. IOI 



and contains no bone. It forms a curtain between the 

 mouth and pharynx; there hangs down from its lower 

 border a soft fleshy projection, named the uvula, gener- 

 ally miscalled the palate. If the mouth be held wide 

 open in front of a mirror, the uvula can be easily seen, 

 and also the opening, between the soft palate and the 

 root of the tongue, which leads into the pharynx. This 

 opening is named the isthmus of the fauces. On its sides 

 are the tonsils. 



7. The Teeth stand almost alone among the organs 

 of the body, in the fact that when broken or seriously 

 injured or much worn, they are not repaired. To 

 do their duty they must be very hard, and they gain 

 this hardness by being so largely made of mineral 

 matter that their living animal part is not present in 

 sufficient quantity to rebuild them when they are broken 

 or decayed. During life two sets of teeth grow. The 

 first, named the milk-teeth, are developed and shed dur- 

 ing childhood. The second set, named the permanent 

 teeth, follow the milk-teeth. If they are lost, we must 

 go to the dentist, for no others will grow to take their 

 places. 



8. The Forms and Uses of Different Teeth, Every tooth 

 consists of a crown, the part which projects into the 

 mouth; of a narrower neck, surrounded by the gums; 

 and of one or more roots or fangs, tightly fitted into pits 

 (called sockets) in the edges of the upper and lower j 



ate. What is the opening seen between the soft palate and root of 

 the tongue ? The organs on each side ? 



7. How do the teeth differ from most other organs as to repair ? 

 How is this accounted for ? What is said of the first set of teeth ? 

 The second? 



8. Of what parts does a tooth consist ? Give names of the different 

 teeth. Describe the incisors. Canines. Molars. Bicuspids, 



